<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>11after</title>
    <style>
        .c1:after {
            content: "NewBalance";
        }

        .item{
            float: left;
        }
        .clearfix:after{
            content: "";
            display: block;
            clear: both;
        }
    </style>
</head>
<body>
<div class="c1">AAA_BBB_CCC</div>
<div class="clearfix">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
</div>
</body>
</html>